From the stunning Mila Kunis' long-term relationship with the boy from Home Alone and more strange relationships

There's nothing more fascinating than a complete relationship mismatch - and this time it's Cameron Diaz and rocker boyfriend Benji Madden that has everyone talking.

The unlikely couple have been dating since May and pals claim their romance is hotting up and the Good Charlotte star has pretty much moved into his girlfriend's luxury home in Beverly Hills.

Although, friends realise they are an odd couple and Cameron usually goes for more clean-cut guys.

A pal told the New York Post newspaper's Page Six column: "Going on appearances alone, people can’t help but stare, as they look completely mismatched."

It seems opposites attract and the friend added: "Benji has pretty much moved into her house in Beverly Hills, and they’ve talked marriage. None of us would be surprised if she called us and said: 'Guess what? I'm Mrs. Madden!'" Wowsa.

But how do they compare with other bizarre celebrity romances? From Macaulay Culkin and Mila Kunis to Brad Pitt and Sinitta - look through the gallery below and be amazed.